3.2
Power
supply
input
Connection
Pulse welding
Pulse welding mode switches the welding output between a high and low current output in a cyclical
manner. When used correctly this function has substantial benefits in the TIG welding process including
greater weld penetration for less work heat input and greater control of the weld pool.
The basic theory for setting the base current using pulse mode is that the base current should be
sufficient to maintain the existing molten weld pool, while the peak current is sufficient to melt new
metal in order to move/ expand the molten weld pool. Increased pulse frequency will have the effect
of making the arc more tightly focused which is useful for fine stainless work and similar. Pulsing can
also be used to help move the weld pool, this technique is useful for welding out of position or with
materials that have higher viscosity weld pool. Higher pulse duty setting will give greater heat input,
while lower pulse duty will have the opposite effect.
MMA parameter settings
Hot start (23)
Hot start provides extra power when the weld starts to counteract the high resistance of the electrode
and workpiece as the arc is started. setting range (0-10).
Arc force (21)
An MMA welding power source is designed to produce constant output current (CC).This means with
different types of electrode and arc length; the welding voltage varies to keep the current constant.
This can cause instability in some welding conditions as MMA welding electrodes will have a minimum
voltage they can operate with and still have a stable arc.
Arc Force control boosts the welding power if its senses the welding voltage is getting too low. The
higher the arc force adjustment, the higher the minimum voltage that the power source will allow.
This effect will also cause the welding current to increase. 0 is Arc Force off, 10 is maximum Arc Force.
This is practically useful for electrode types that have a higher operating voltage requirement or joint
types that require a short arc length such as out of position welds.
Alarm Indicator (31)
Lights when over voltage, over current, input phase loss or electrical overheating (due to exceeding
duty cycle) is detected and protection is activated. When protection is activated, welding output will
be disabled until the safety system senses the overload has reduced sufficiently and indicator lamp
goes out. May also trigger if machine experiences an internal power circuit failure.
The TIG series of welding machines is designed to operate on a 110V/220V AC power supply.
When the power supply voltage is over the safe work voltage, there are over voltage and under
voltage protection inside the welder, the alarm light will on, at the same time, the current output will be
cut off.
If the power supply voltage continually goes beyond the safe work voltage range, it will shorten the
welder life-span. The below measures can be used:
-
Change the power supply input net. Such as, connect the welder with the stable power supply
voltage of distributor;
-
Induce the machines using power supply in the same time;
-
Set the voltage stabilization device in the front of power cable input.